﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Example39
{
    class Program
    {
        static void Main(string[] args)
        {
            CReatangle recta = new CReatangle(3,4);
            CReatangle rectb = new CReatangle();
            Console.WriteLine("recta:"+recta.area()); //sua dau phay thanh dau +;
            Console.WriteLine("rectb:"+ rectb.area());
            Console.ReadLine();

        }
    }
}
